class SetCharsetForMysql < ActiveRecord::Migration def all_models @all_models ||= [ Agent, AgentLog, Contact, Event, Link, Scenario, ScenarioMembership, User, UserCredential, Delayed::Job, ] end def change # This is migration is for MySQL only. return unless mysql? reversible do |dir| dir.up do all_models.each { |model| table_name = model.table_name # `contacts` may not exist next unless connection.table_exists? table_name model.columns.each { |column| name = column.name type = column.type limit = column.limit options = { limit: limit, null: column.null, default: column.default, } case type when :string, :text options.update(charset: 'utf8', collation: 'utf8_unicode_ci') case name when 'username' options.update(limit: 767 / 4, charset: 'utf8mb4', collation: 'utf8mb4_unicode_ci') when 'message', 'options', 'name', 'memory', 'handler', 'last_error', 'payload', 'description' options.update(charset: 'utf8mb4', collation: 'utf8mb4_bin') when 'type', 'schedule', 'mode', 'email', 'invitation_code', 'reset_password_token' options.update(collation: 'utf8_bin') when 'guid', 'encrypted_password' options.update(charset: 'ascii', collation: 'ascii_bin') end else next end change_column table_name, name, type, options } execute 'ALTER TABLE %s CHARACTER SET utf8 COLLATE utf8_unicode_ci' % table_name } execute 'ALTER DATABASE %s CHARACTER SET utf8 COLLATE utf8_unicode_ci' % connection.current_database end dir.down do # Do nada; no use to go back end end end def mysql? ActiveRecord::Base.connection.adapter_name =~ /mysql/i end end